The cell membrane is composed of a phospholipids by-layer that selectively allows substances in and out of the cell. The movement of substances in and out of the cell is a function of various transport mechanisms. The type of transport employed is in turn determined by the type of substance transported (Chiras, 2010).
Osmosis is a form of transport that occurs across a cell membrane. The process involves migration of water molecules from an area of elevated water concentration to an area of decreased water concentration via a semi-permeable membrane (Audesirk, Audesirk & Byers, 2008). The cell membrane acts as the semi-permeable membrane as it allows only the small water molecules to move across it while preventing movement of the solutes that are big in siz
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